Refrigerating apparatus



Filed May so, 1928 attomwqi Patented Sept. 17, 1929 UNITED" STATESPATENT OFFICE JESSE G. KING, OF DAYTON, OHIO, ASSIGNOR TO 'FRIGIDAIRECORPORATION, 01'

DAYTON, OHIO, A. CORPORATION 01! DELAWARE REFRIGERATING APPARATUSApplication filed Kay 30,

This invention relates to refrigerating apparatus and more particularlyto.an apparatus for installation in what is commonly called an ice creamcounter.

6 An object of this invention is to provide" a fitting for adapting astandard evaporator so that it may be used in a system where severaltemperatures are to be obtained.-

Another object of this inventionv is to pro vide an evaporator orcooling unit with a fitting adapting it to be used with systems forfurnishing several different temperatures, for instance, in an ice creamcabinet."

Further objects and advantages of the present invention will be apparentfrom the following description, reference being had to the accompanylngdrawings, wherein a preferred form of embodiment of the presentinvention is clearly shown.

In the drawings:

Fig. 1 is a view partly in elevation, partly in section and partlydiagrammatic of a refrigerating system embodying my invention, and

Fig. 2 is a view-in elevation of one type of standard evaporator adaptedto be changed for use in said system.

A refrigerating system embodying features of my invention is generalldesignated as 20. It may comprise a re gerant liquefying unit which, inthis embodiment, may comprise a compressor 21 delivering compressedrefrigerant to a condenser 22. The refrigerant condensed inthe condenser22 is stored in the receiver23 fromwhich it is delivered as required. toan evaporator generally designated as 24. The evaporator 24 is-adaptedto feed chilled liquid refrigerant to a body to be cooled, in this caseshown as a sirup rail 25, from whence liquid refrigerant is delivered toa second evaporator 26. Refrigerant evaporated in evaporator 26 isreturned thru the pipe 27 to the compressor 21, for instance, thru thecrankcase. A portion of the refrigerant delivered to the evaporator 24is evaporated therein, and this evaporated refrigerant leaves theevaporator thru the "pipe '28, fitting 29, valve 30, pipe 31, andautomatic valve 32 back to the compressor 21. The valve 32 remainder ofthe 1928. Serial No. 281,605.

is an automatic valve adapted to maintain a pressure in evaporator 24somewhat higher than the pressure in evaporator 26. Thus the evaporator24 is maintained at a higher temperature and may be used to coolthesupplies requiring relatively higher temperatures, such as. the water,while the evaporator 26 may be used for the coldest temperaturesrequired, for instance, to cool the brine for maintaining the ice creamin no a frozen condition.

The evaporation of the refrigerant in evaporator 24 chills the liquidrefrigerant in said evaporator. A art. ofthe chilled liquid refrigerantmay e taken thru the 06 pipe 33 and thru the branch 34 to the pipe 35which may be used to cool the sirup in the various containers of thesirup rail 25. The refrigerant thence passes to the inlet '36 of theevaporator 26 provided with a float controlled valve, not shown, inevaporator 26. The difference in pressure maintained between evaporator24 and the evaporator 26 by means of the valve 32 causes the flow ofliquid refrigerant thru the pipe 35. Thus it is .seen that severaldifferent temperatures may be maintained in the cabinet, as for in--stance, the zone cooled by the evaporator 24, the zone cooled by pipe 35and the zone cooled by the evaporator 26. p Means for rendering theoperation of the refrigerant liquefying a paratus automatic may beprovided. For t is purpose a motor 39 may drive the compressor 21 thrusome medium such as the belt 40. An expansible 86 bellows 41 may beconnected to the pipe 27 by means of the pipe 42, The expansible bellows41 is adapted to operate a snap switch 43 which controls the startingand stopping of the electric motor 39. In.this 00 particular embodiment,the bellows 41 is actuatedby the ressure prevailing in the evaporator26. Since the evaporator 26 is to be maintained at the lowest pressure,the

system is automatically 96 maintained at its proper pressure becausetheflow of the refrigerant is in the direction of the lowest pressure,which, in this 3 is in 1 9 evaporator 26 and the return 11116 27,-

' 15 is ada In order that a standard evaporator may be used for makingthis type ofinstallation the fitting 29 is adapted to be placed intheusual evaporated refrigerant outlet 5 of a standard evaporator: InFig. 2 is shown a type of standard evaporator which may be changed by myimproved fitting in order to adapt it to the system herein described. Asshown, this evaporator is similar to evaporator 26. It may be providedwith afloat controlled inlet 45 and an evaporated refrigerant outletneedle valve fitting 30. The inlet and the outlet fittings are adaptedto be mounted on a, plate 47, which ted to receive the inlet and theoutlet fittings in the proper openings. 'In order to adapt thisevaporator for the system heretofore described it is only necessary tounscrew the fitting 30 from the plate 47 The fitting 29 may then beplaced in the opening left by the fitting 30 and thereafter the regularfitting 30 maybe inserted in the fitting 29. 1

The fitting 29 may be made by providing a lpassage 48 for theevaporated'refrigerant. e .fitting may have a shouldered reduced endforinsertion into the late and a shouldered enlarge}? tpening or receivingthe fitting 30. e ttings 29 and 30 may be 30 secured to the. late 47 bymeans of bolts 30 passing thru th fittings. A branch 49 may be madein'said fitting 29. This branch 49 may have a tube 33 soldered'theretoso that-no evaporated refri erant may pass out 35 of the branch 49. Inacing the fitting 29 -on the late 47, the tu e 33 maybe first inserted tu the tube 28' and ma be bent into the position shown inFig. 1 a ter thefitting 29 has'been bolted, in place as herein before 4o described.Thereafter, the plate 47 ma be 3 attached to the evaporator. The end ethe tube 33 may be cut at a angle, as shown,

in order to insure that the en of the pipe is not closed by the walls ofthe evaporator.

'45 The branch 49 may then have the fitting 34, which may be of theneedle valve variety, screwed fthereto'to which the pipe 35 may beconnected.

While the form of embodiment of the pres.-

50 ent invention as herein disclosed, constitutes a preferred form,'itis to be understood that other vforms might be adopted, all comin-withinthe scope of the claims which fo ow. y

What is claimed is as follows:

1. A coolin unit comprising a float chamber, a re igerant 'inlet, afloat contrpl led valve in saidinlet, an em rated refrigerant outlethaving its termina above the normal liquid level in said unit, a fittingsaid outlet provided with a tube extending)below said normal liquidlevel and with a ranch for delivering liquid refrigerant from said tube.

05 2. A-cooling unit comprising a liquid refri erant chamber, anautomaticall contro ed refrigerant inlet in said cham er, an evaporatedrefrigerant outlet havin its terminal above the normal liquid love insaid unit, a fittin in said outlet provided with a tube exten in belowsaid normal liquid level and with a ranch for delivering liquidrefrigerant from said tube.

3. A cooling unit comprisin a float chamber, a refrigerant inlet, a oatcontrolled valve in said inlet, an evaporated refrigerant outlet havingits terminal above the normal liquid level in said unit, a fitting insaid outlet provided with an extension below said normal liquid leveland with a branch for delivering liquid refrigerant from said extension.

4. -A fitting to be placed inthe regulation evaporated refrigerantoutlet of an evaporator, said fitting being provided with an extensionadapted to extend below the normal liquid refrigerant level in saidevaporator andbeing provided with a branch for delivering liquidrefrigerant from said extension and with a branch for deliveringevaporated refrigerant from said evaporator.

5. 'A plate for making refrigerant conduit connections with anevaporator said plate being provided with a liquid refrigerant,automatically controlled inlet, an evaporated refrigerant outlet and afitting adapted to be placed in said evaporated refri erant outlet, saidfitting being provided with an. extension passing thru said outlet andadapted to extend below the normal liquid level in said evaporator,and-with branches for evaporated refrigerant and chilled liquidrefrigerant respectively.

In testimony whereof I hereto afiix' my signature.

' JESSE G. KING.

